Electronic structure of the SrTiO3/LaAlO3 interface revealed by resonant soft x-ray scattering
Abstract
We investigated the electronic structure of the SrTiO3/LaAlO3 superlattice (SL) by resonant soft x-ray scattering. The (003) peak, which is forbidden for our "ideal" SL structure, was observed at all photon energies, indicating reconstruction at the interface. From the peak position analyses taking into account the effects of refraction, we obtained evidence for electronic reconstruction of Ti 3d and O 2p states at the interface. From reflectivity analyses, we concluded that the AlO2/LaO/TiO2/SrO and the TiO2/SrO/AlO2/LaO interfaces are quite different, leading to highly asymmetric properties.
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